A circular water tank of radius 5m and length of 25m is being filled with water at the constant rate of 2 m3/s.[br]The depth of water in the tank, h (in m) is to be plotted against the time t (in s).[br]This applet shows the plot of h vs t.

Move point B in order to see the change in the water depth and the corresponding time taken.[br][br]Higher Order Task :[br]Can you describe how the applet works? (Hint : Answer the series of questions)[br](a) What geometrical variable(s) does moving the point B change directly in the above applet ?[br](b) Is the shaded(filled) cross sectional area of the tank dependent directly on time or other geometrical values eg value(s) in (a) above?[br](c) Is the time independently changing, or is it calculated from the geometrical variables? Or is/are the geometrical variables changing because of time in this applet?